如何在datagridview中保存图像流

Question

NOTE: this is windows app, sql server as database, ado.net.

i insert images in datagridview temporarily then loop through them and save each row in database. i know how to insert stream from picturebox like this

    MemoryStream stream = new MemoryStream();
pictureBox1.Image.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
byte[] pic = stream.ToArray();
SqlCommand cmda = new SqlCommand("INSERT INTO KeyWord (ItemName, DateEntry,image, imageindex) VALUES (N'" + listBoxI.ToString() + "', GETDATE(), @image, 1)", cn);
cmda.Parameters.AddWithValue("@Pic", pic);
try
{
    cn.Open();
    cmda.ExecuteNonQuery();
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message);
}
finally
{
    cn.Close();
}

i want to replace pictureBox1 with dataGridView1.Rows[x].Cells[1].Value

my question is how to save images from datagridview?

Answer 1

You can go like this:

Image myImg = (dataGridView1.Rows[x].Cells[1].Value as Image);
myImg.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);

Or in one line without the usage of a variable:

(dataGridView1.Rows[x].Cells[1].Value as Image).Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);

You know that the value of DataGridViewImageColumn is Image hence the conversion is safe.